82 
ZOOLOGY OF THE VOYAGE OF THE BEAGLE. 
Negro and Bahia Blanca. Otherwise we must believe that the same animal 
utters different kinds of noises, in different districts ; a fact which I should feel 
much inclined to doubt. 
“ Azara* says that the Tucutuco may be ‘ found every where ; provided that 
the soil be pure sand, and the situation not subject to be overflowed. As these 
conditions are fulfilled only in certain spots, their warrens are far separated 
from each other, even sometimes more than twenty-five leagues, without it being 
possible to conceive how these animals have been able to pass from one place to 
another.’ The difficulty, I think, is much overstated ; for, as I have said, the 
burrows of the Tucutuco are sometimes made in very damp places, near lakes ; 
so that they certainly might pass over almost any kind of country. But if the C. 
Braziliensis and C. Magellanicus be considered as one species, as some French 
authors are inclined to do, then the difficulty will be increased in a very remark- 
able manner, as we shall be obliged to transport the Tucutuco over wide plains of 
shingle, and across many great rivers, and an arm of the sea.” — D. 
PoEPHAGOMYS ATER. 
Poephagomys ater, F. Cuvier , Annales des Sciences Naturelles, 
2d series, Zoologie, tom. I. p. 321. June, 1834. 
Chile, ( September .) 
“ This animal is generally scarce, but in certain districts, I believe, of an 
alpine character, it is abundant. It excavates very extensive superficial burrows, 
no doubt, for the purpose of feeding on the roots of plants, as in the case of the 
Ctenomys Braziliensis, the habits of which have just been described. Horses 
passing over districts frequented by these animals, sink fetlock deep through the 
turf. I procured my specimen from Valparaiso, where the country-people called 
it ‘ Cururo.’ ” — D. 
Oci'ODON CuMINGII. 
Octodon Cumingii, Bennett , Proc. of Committee of Science and Correspondence 
of the Zool. Soc. for 1832, p. 46. 
Transactions of the Zoological Society of London, vol. ii. p. 81. PI. 16. 
Dendrobius Degus, Meyen. Acta Academiaa, c. 1. c. Naturae Curiosorum, xvi. p. 610. 
PI. 44, 1833. 
Valparaiso, Chile, {October.) 
* Azara Voyage dans 1’Amerique Meridionale, vol. i. p. 324. 
